Building structure



FIG. 1 is a front elevational view of a building structure showing our new design;

FIG. 2 is a rear elevational view of the building structure of FIG. 1;

FIG. 3 is a side elevational view of the building structure of FIG. 1, as seen looking left to right in FIG. 1;

FIG. 4 is a side elevational view of the building structure of FIG. 1, as seen looking right to left in FIG. 1; and

FIG. 5 is a top plan view of the building structure. 

The ornamental design for a building structure, as shown. 